Lock



Nov. 14, 1933. HURD 1,935,225

LOCK

Filed May 20, 1933 INVENTOR Nam/w 5 Hum A ORNEYS- Patented Nov. 14, 1933 UNITED STATES r LOCK Norman B. Hurd, Newington, Conn, assignor to The American Hardware Corporation, New

Britain, Conn., a corporation of Connecticut 7 Application'May 20, 1933. Serial No. 671,967

2 Claims.

My invention relates to a lock, and more particularly to improvements in means for deadlocking a lock bolt.

In locks as at present constructed it is com- 5 mon to provide the dead-bolt with an abutment member, usually termed a stump, carried directly thereby, which stump consequently moves the full distance of travel of the dead-bolt. When the dead-bolt is projected, one or more tumblers pass behind the stump and thus dead-lock the bolt in projected position. The tumblers are arranged to be moved by means of a key, and the tumblers are provided with slots for the reception of the stump, so that when the key raises the tumblers to position the slots in alignment with the stump, rotation of the key serves to retract the dead-bolt and the stump passes into the slots in the tumblers.

For dead-bolts having a small or normal throw such an arrangement is satisfactory. However, in a lock designed to have an abnormally long throw of the dead-bolt, the slots extending into the tumblers are abnormally deep, and when a plurality of slots are cut in each tumbler and the slots are close together, a very thin and consequently weak tongue is provided in the tumbler between the slots. Such a tongue may be broken or bent by one attempting to force the lock, and the lock may then either be opened by an unauthorized person or damaged so that it cannot be readily unlocked by one possessed of a proper key.

It is the principal object of the invention, therefore, to provide improved dead-locking means in a lock with a dead-bolt designed to have a long throw, and which cannot be readily damaged or gotten out of order, and which is exceedingly compact.

It is another object to provide dead-locking means, actuated in part by or with the dead-bolt the dead-bolt. V b

The drawing shows, for illustrative purposes only, a lock in side elevation with the cover plate removed to illustrate features of the invention.-

In said drawing 5 indicates a lock case having the usual face plate 6, through which projects the dead-bolt 7. The dead-bolt head may be guided to reciprocate at its forward end in the face plate and at its tail end on a stud 8, car- Had by the case and passing through a slot 9 in the dead-bolt tail. The dead-bolt is designed to be projected and retracted by means of the usual key 10, as is well understood. a Locks of this type usually embody a plurality of tumblers, one tumbler 11 only being shown for and movable a distance less than the throw of,

the sake of clarity of illustration. The key 10 is bitted so as to actuate the tumblers, typified by the single tumbler 11, against the tension of the spring 12, as will be understood. In its preferred form the rear end of the tumbler 11 is pivotally mounted on the stud 8 and projects forwardly therefrom, the forward end being arcuate and located to the rear of the bolt head 7.

In locks of the prior art as heretofore indicated the stump is normally carried directly by the dead-bolt, and when the latter-is projected the stump is designed to stand in front of the tumbler, which drops down to the position, as indicated in the drawing. When the dead-bolt is to be retracted the key 10 raises the tumblers, which are provided with slots for the reception of the stump, so that when the key retracts the dead-bolt the stump passes into the slots.

In accordance with my invention which provides for an abnormal throw to the bolt, the slot' or slots in the tumblers may be made relative- 1y shallow, as compared with said throw, so that when a plurality of slots is provided in the same tumbler, the portion of the tumbler forming a tongue between two slots will be relatively short and consequently quite rigid. In the form illustrated, in place of carrying the stump 16 directly on the dead-bolt, I provide means to carry the same, such as the lever 13, pivoted to the lock case at 14 laterally'of the bolt and pivoted to the dead-bolt itself at the opposite side of the latter as at 15. Thus, when the dead-bolt is projected and retracted the upper end of the lever 13 moves with the dead-bolt and oscillates on the pivot 14. In the drawing the bolt is shown as retracted with the stump 16 standing in the slot 17 and the tumbler 11 has dropped down so as to block the stump 16, and consequently the dead-bolt, against projection until the tumbler has been raised. With the stump 16 positioned as illustrated about the middle of the lever 13, the stump 16 has only about one-half the movement of the dead-bolt, and consequently the tumbler slot or slots need be of a depth only about one-half the throw of the dead-bolt. When the tumbler 11 is raised so as to free the stump 16 and the deadbolt projected to the dot-and-dash position shown, the stump 16 will stand forward and free of the tumbler, and the latter will drop down to the position of rest illustrated, and thus the dead-bolt will be dead-locked in its projected position.

In order to actuate the dead-bolt in one or both directions by means of a master key it is usual to provide another slot, as 18, in each tumbler, and

it often happens that the slots 17, 18 are quite close together, thus leaving an intermediate or tongue portion 19 which is relatively narrow. If the slots 17, 18 were extended into the tumbler a distance sufiicient to permit the proper reception of the stump 16 when the latter is carried directly by the dead-bolt instead of as illustrated, the tongue portion 19 would be exceedingly long and correspondingly weak, and open to danger of being bent or damaged by one attempting to force the lock. By means of my invention the stump 16 may be so positioned on its lever 13 as to require only very shallow slots or notches 17, 18;

that is to say, by positioning the stump 16 nearer the pivot 14 the less will be the movement of the stump 16, and consequently the shallower may be the slots 17, 18.

The lock illustrated, except for the arrangement of the dead-locking means, is of more or less conventional type, and since the look as illustrated operates in the conventional manner no further description of its operation than already given is deemed to be necessary.

While one particular form of the invention has been illustrated, it is to be understood that various embodiments of the invention may be made within the scope of the invention as defined in the appended claims.

I claim: V

1. In a look, a lock case, a reciprocable deadbolt therein, a tumbler pivoted at one end to the case at the rear of said bolt, the opposite end of said tumbler being notched and facing toward the rear of the dead-bolt head, a lever pivoted at one end to the case at one side of said bolt and at the other end to the opposite side of said bolt, a stump carried by the lever intermediate its ends and coacting with the notched end of the turn- .bler, said stump engaging in a tumbler notch when the tumbler is in one position to hold the bolt retracted and engaging the edge of the tumbler outside of said notch when the tumbler is in another position to hold the bolt projected.

2. In a look, a case, a reoiprocable dead-bolt therein, a tumbler mounted in the case to oscillate transversely of the bolt head, said tumbler being notched at its forward edge, a lever pivoted to the case at one end at one side of said bolt and at the other end to the opposite side of the bolt, a stump mounted on the lever approximately midway its length and directlyto the rear of said bolt head and adapted to engage in a tumbler notch to hold the bolt retracted and to engage another part of the tumbler to hold the bolt advanced.

NORMAN B. HURD. 

